// JavaScript Document
// drag_windows.js

// Global object to hold drag information.
 
var dragObj = new Object();
dragObj.zIndex = 0;
 
function dragStart(event, id) {
 
  var el;
  var x, y;
 
  // If an element id was given, find it. Otherwise use the element being
  // clicked on.
 
  if (id)
    dragObj.elNode = document.getElementById(id);
  else {
      dragObj.elNode = event.target;
 
    // If this is a text node, use its parent element.
 
    if (dragObj.elNode.nodeType == 3)
      dragObj.elNode = dragObj.elNode.parentNode;
  }
 
  // Get cursor position with respect to the page.
 
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
 
  // Save starting positions of cursor and element.
 
  dragObj.cursorStartX = x;
  dragObj.cursorStartY = y;
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);
  dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10);
 
  if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
  if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = 0;
 
  // Update element's z-index.
 
  dragObj.elNode.style.zIndex = ++dragObj.zIndex;
 
  // Capture mousemove and mouseup events on the page.
 
    document.addEventListener("mousemove", dragGo,   true);
    document.addEventListener("mouseup",   dragStop, true);
    event.preventDefault();
}
 
function dragGo(event) {
 
  var x, y;
 
  // Get cursor position with respect to the page.
 
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;
 
  // Move drag element by the same amount the cursor has moved.
 
  dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";
  dragObj.elNode.style.top  = (dragObj.elStartTop  + y - dragObj.cursorStartY) + "px";
 
    event.preventDefault();
}
 
function dragStop(event) {
 
  // Clear the drag element global.
 
  dragObj.elNode = null;
 
  // Stop capturing mousemove and mouseup events.
 
    document.removeEventListener("mousemove", dragGo,   true);
    document.removeEventListener("mouseup",   dragStop, true);
}

function pushtoback(msg) {
	document.getElementById(msg).style.zIndex  = -1;
}